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Siemens Simatic S7-400 User Manual

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M7-400 Expansions

12-11

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Addresses Within an Expansion Module

Each expansion module occupies 256 bytes (100

H

) within the CPU/FM address

area. The division of the 256 addresses within an expansion module can be seen
from Table 12-2.

Table 12-2 Division of Addresses Within an Expansion Module

Address

Function/Slot

Remarks

00

H

to 3F

H

Reserved

In this address area, the automation computer’s
BIOS makes basic settings in the expansion
module such as assignment of interrupts, etc.

40

H

to 7F

H

Interface submodule x

80

H

to BF

H

Interface submodule y

C0

H

to FF

H

Interface submodule z

Base Addresses of the Interface Submodules

Special characteristics of the interface submodules such as the location of the
AT-compatible I/O addresses (IF 962-COM, IF 962-LPT, ...) are set via the base
addresses, or the interface submodules are accessed exclusively via these base
addresses (IF 961-DIO, IF 961-AIO,...).

The base address for an interface submodule is obtained from the sum of the
slot-dependent address of the expansion module and the interface submodule
address within the expansion module. You can find the resulting base addresses in
Tables 12-3 and 12-4:

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